# Heidelberg 2015 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 10: Poster: Interaction with strong or short laser pulses

### A 10.9: Poster

### Montag, 23. März 2015, 17:00–19:00, C/Foyer

**Strong bichromatic laser field ionization of atoms and "the phase of the phase" in the photoelectron yield** — •Mohammad Adel Almajid and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

There have been various attempts to include Coulomb effects into the plain strong field approximation (SFA), one of them being the Coulomb-Volkov approximation (CVA). In our work, we consider two-color, colinearly polarized laser pulses. The relative phase between the two field components affects the photoelectron dynamics. A pronounced disagreement between exact TDSE and CVA-SFA photoelectron spectra is found for low energies. The rescattered electrons instead are well described already by the SFA (extended for the rescattering matrix element). We analyze the photoelectron spectra by Fourier-transforming the momentum-dependent yield as a function of the relative phase between the two pulses, thus obtaining "the phase of the phase". Plotted vs the momenta parallel and perpendicular to the laser polarization direction, this entity tells how the yield of photoelectrons with a certain final momentum is synchronized with respect to changes of the relative phase. The overall structure of these phase-of-the-phase spectra can be understood in terms of quantum trajectories while details are target-sensitive.